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x in (-oo:+oo)
-x/6 = 2/3 // - 2/3
-x/6-(2/3) = 0
-x/6-2/3 = 0
-1/6*x-2/3 = 0 // + 2/3
-1/6*x = 2/3 // : -1/6
x = 2/3/(-1/6)
x = -4
x = -4
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